Segfault/crash with two subdivision surface modifiers, latter one with viewport level 0 #97534

New Issue

Solus · 2022-04-22T06:14:47+02:00

Solus commented

2022-04-22 06:14:47 +02:00

System Information
Operating system: Linux-5.13.0-40-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: AMD Radeon RX 5700 XT (NAVI10, DRM 3.41.0, 5.13.0-40-generic, LLVM 12.0.0) AMD 4.6 (Core Profile) Mesa 21.2.6

(OS is Ubuntu 20.04)

Blender Version
Broken: version: 3.1.2, branch: master, commit date: 2022-03-31 17:40, hash: cc66d1020c

(Blender was installed from Snap)

Short description of error
Blender crashes with segmentation fault when adding two subdivision surface modifiers to an object and setting the viewport level of the last applied one (bottom one in the view) to 0.

Exact steps for others to reproduce the error

Create new default scene
Select the default cube
Go in the Modifiers tab
Add two Subdivision Surface modifiers
Set the "Levels Viewport" of the second modifier (bottom one) to 0
Blender will crash immediately

Note: I've seen other bugs like #97371, #97330, #97282 and #97160 - but unlike their cases, in my case it only crashes with two subsurf modifiers and the latter one having a viewport level of 0.

Note 2: In Preferences -> Viewport, disabling GPU Subdivision does fix the issue. I assume that means the problem is about compatibility with my graphics card; I'm reporting the bug anyways, in case something can be done about it.

Crash logs:
blender.crash.txt

**System Information** Operating system: Linux-5.13.0-40-generic-x86_64-with-glibc2.31 64 Bits Graphics card: AMD Radeon RX 5700 XT (NAVI10, DRM 3.41.0, 5.13.0-40-generic, LLVM 12.0.0) AMD 4.6 (Core Profile) Mesa 21.2.6 (OS is Ubuntu 20.04) **Blender Version** Broken: version: 3.1.2, branch: master, commit date: 2022-03-31 17:40, hash: `cc66d1020c` (Blender was installed from Snap) **Short description of error** Blender crashes with segmentation fault when adding two subdivision surface modifiers to an object and setting the viewport level of the last applied one (bottom one in the view) to 0. **Exact steps for others to reproduce the error** - Create new default scene - Select the default cube - Go in the Modifiers tab - Add two Subdivision Surface modifiers - Set the "Levels Viewport" of the *second* modifier (bottom one) to 0 - Blender will crash immediately **Note:** I've seen other bugs like #97371, #97330, #97282 and #97160 - but unlike their cases, in my case it only crashes with *two* subsurf modifiers and the *latter* one having a viewport level of 0. **Note 2:** In Preferences -> Viewport, disabling GPU Subdivision **does** fix the issue. I assume that means the problem is about compatibility with my graphics card; I'm reporting the bug anyways, in case something can be done about it. Crash logs: [blender.crash.txt](https://archive.blender.org/developer/F13015323/blender.crash.txt)

Solus commented

2022-04-22 06:14:47 +02:00

Added subscriber: @Solus-3

Pratik Borhade commented

2022-04-22 11:14:04 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-04-22 11:14:04 +02:00

Same bug as in #96565 which was later merged in #96283 (GPU subdivision: Last subsurf modifier is always used for GPU subdivision, even when disabled.)
So I'll merge this report into #96283.
Thanks for the report

Same bug as in #96565 which was later merged in #96283 (GPU subdivision: Last subsurf modifier is always used for GPU subdivision, even when disabled.) So I'll merge this report into `#96283`. Thanks for the report

Pratik Borhade commented

2022-04-22 11:14:29 +02:00

Closed as duplicate of #96283

Pratik Borhade closed this issue

2022-04-22 11:14:29 +02:00

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Segfault/crash with two subdivision surface modifiers, latter one with viewport level 0 #97534